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tune_kernel.sh
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tune_kernel.sh
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#!/bin/bash
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http:https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Copyright Clairvoyant 2017
PATH=/usr/bin:/usr/sbin:/bin:/sbin:/usr/local/bin
# https://access.redhat.com/sites/default/files/attachments/20150325_network_performance_tuning.pdf
# https://docs.aws.amazon.com/AmazonS3/latest/dev/TCPWindowScaling.html
# https://docs.aws.amazon.com/AmazonS3/latest/dev/TCPSelectiveAcknowledgement.html
# http:https://www.cloudera.com/documentation/other/reference-architecture/PDF/cloudera_ref_arch_metal.pdf
# Cloudera Professional Services recommendations:
DATA="net.core.netdev_max_backlog = 250000
net.core.optmem_max = 4194304
net.core.rmem_default = 4194304
net.core.rmem_max = 4194304
net.core.wmem_default = 4194304
net.core.wmem_max = 4194304
net.ipv4.tcp_adv_win_scale = 1
net.ipv4.tcp_low_latency = 1
net.ipv4.tcp_sack = 1
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_rmem = 4096 87380 4194304
net.ipv4.tcp_wmem = 4096 65536 4194304"
# Disable TCP timestamps to improve CPU utilization (this is an optional parameter and will depend on your NIC vendor):
# net.ipv4.tcp_timestamps=0
# Enable TCP sacks to improve throughput:
# net.ipv4.tcp_sack=1
# Increase the maximum length of processor input queues:
# net.core.netdev_max_backlog=250000
# Increase the TCP max and default buffer sizes using setsockopt():
# net.core.rmem_max=4194304
# net.core.wmem_max=4194304
# net.core.rmem_default=4194304
# net.core.wmem_default=4194304
# net.core.optmem_max=4194304
# Increase memory thresholds to prevent packet dropping:
# net.ipv4.tcp_rmem="4096 87380 4194304"
# net.ipv4.tcp_wmem="4096 65536 4194304"
# Enable low latency mode for TCP:
# net.ipv4.tcp_low_latency=1
# Set the socket buffer to be divided evenly between TCP window size and application buffer:
# net.ipv4.tcp_adv_win_scale=1
# Page allocation errors are likely happening due to higher network load where
# kernel cannot allocate a contiguous chunk of memory for a network interrupt.
# This happens on 10GbE interfaces of various manufacturers.
# vm.min_free_kbytes = 1048576
# Function to discover basic OS details.
discover_os() {
if command -v lsb_release >/dev/null; then
# CentOS, Ubuntu, RedHatEnterpriseServer, RedHatEnterprise, Debian, SUSE LINUX, OracleServer
# shellcheck disable=SC2034
OS=$(lsb_release -is)
# CentOS= 6.10, 7.2.1511, Ubuntu= 14.04, RHEL= 6.10, 7.5, SLES= 11, OEL= 7.6
# shellcheck disable=SC2034
OSVER=$(lsb_release -rs)
# 7, 14
# shellcheck disable=SC2034
OSREL=$(echo "$OSVER" | awk -F. '{print $1}')
# Ubuntu= trusty, wheezy, CentOS= Final, RHEL= Santiago, Maipo, SLES= n/a
# shellcheck disable=SC2034
OSNAME=$(lsb_release -cs)
else
if [ -f /etc/redhat-release ]; then
if [ -f /etc/centos-release ]; then
# shellcheck disable=SC2034
OS=CentOS
# shellcheck disable=SC2034
OSREL=$(rpm -qf /etc/centos-release --qf='%{VERSION}\n' | awk -F. '{print $1}')
# shellcheck disable=SC2034
OSNAME=$(awk -F"[()]" '{print $2}' /etc/centos-release | sed 's| ||g')
if [ -z "$OSNAME" ]; then
# shellcheck disable=SC2034
OSNAME="n/a"
fi
if [ "$OSREL" -le "6" ]; then
# 6.10.el6.centos.12.3
# shellcheck disable=SC2034
OSVER=$(rpm -qf /etc/centos-release --qf='%{VERSION}.%{RELEASE}\n' | awk -F. '{print $1"."$2}')
elif [ "$OSREL" == "7" ]; then
# 7.5.1804.4.el7.centos
# shellcheck disable=SC2034
OSVER=$(rpm -qf /etc/centos-release --qf='%{VERSION}.%{RELEASE}\n' | awk -F. '{print $1"."$2"."$3}')
elif [ "$OSREL" == "8" ]; then
if [ "$(rpm -qf /etc/centos-release --qf='%{NAME}\n')" == "centos-stream-release" ]; then
# shellcheck disable=SC2034
OS=CentOSStream
# shellcheck disable=SC2034
OSVER=$(rpm -qf /etc/centos-release --qf='%{VERSION}\n' | awk -F. '{print $1}')
else
# shellcheck disable=SC2034
OSVER=$(rpm -qf /etc/centos-release --qf='%{VERSION}.%{RELEASE}\n' | awk -F. '{print $1"."$2"."$4}')
fi
else
# shellcheck disable=SC2034
OS=CentOSStream
# shellcheck disable=SC2034
OSVER=$(rpm -qf /etc/centos-release --qf='%{VERSION}\n')
fi
elif [ -f /etc/oracle-release ]; then
# shellcheck disable=SC2034
OS=OracleServer
# 7.6
# shellcheck disable=SC2034
OSVER=$(rpm -qf /etc/oracle-release --qf='%{VERSION}\n')
# shellcheck disable=SC2034
OSNAME="n/a"
else
# shellcheck disable=SC2034
OS=RedHatEnterpriseServer
# 8.6, 7.5, 6Server
# shellcheck disable=SC2034
OSVER=$(rpm -qf /etc/redhat-release --qf='%{VERSION}\n')
# shellcheck disable=SC2034
OSREL=$(echo "$OSVER" | awk -F. '{print $1}')
if [ "$OSVER" == "6Server" ]; then
# shellcheck disable=SC2034
OSVER=$(rpm -qf /etc/redhat-release --qf='%{RELEASE}\n' | awk -F. '{print $1"."$2}')
elif [ "$OSREL" == "8" ]; then
# shellcheck disable=SC2034
OS=RedHatEnterprise
fi
# shellcheck disable=SC2034
OSNAME=$(awk -F"[()]" '{print $2}' /etc/redhat-release | sed 's| ||g')
fi
# shellcheck disable=SC2034
OSREL=$(echo "$OSVER" | awk -F. '{print $1}')
elif [ -f /etc/SuSE-release ]; then
if grep -q "^SUSE Linux Enterprise Server" /etc/SuSE-release; then
# shellcheck disable=SC2034
OS="SUSE LINUX"
fi
# shellcheck disable=SC2034
OSVER=$(rpm -qf /etc/SuSE-release --qf='%{VERSION}\n' | awk -F. '{print $1}')
# shellcheck disable=SC2034
OSREL=$(echo "$OSVER" | awk -F. '{print $1}')
# shellcheck disable=SC2034
OSNAME="n/a"
fi
fi
}
_sysctld() {
FILE=/etc/sysctl.d/cloudera-network.conf
install -m 0644 -o root -g root /dev/null "$FILE"
cat <<EOF >"${FILE}"
# Tuning for Hadoop installation. CLAIRVOYANT
# Based on Cloudera Professional Services recommendations.
$DATA
EOF
}
echo "********************************************************************************"
echo "*** $(basename "$0")"
echo "********************************************************************************"
# Check to see if we are on a supported OS.
discover_os
if [ "$OS" != RedHatEnterpriseServer ] && [ "$OS" != CentOS ] && [ "$OS" != OracleServer ] && [ "$OS" != Debian ] && [ "$OS" != Ubuntu ]; then
echo "ERROR: Unsupported OS."
exit 3
fi
echo "Tuning Kernel parameters..."
FILE=/etc/sysctl.conf
if [ "$OS" == RedHatEnterpriseServer ] || [ "$OS" == CentOS ] || [ "$OS" == OracleServer ]; then
if [ ! -d /etc/sysctl.d ]; then
for PARAM in $(echo "$DATA" | awk '{print $1}'); do
VAL=$(echo "$DATA" | awk -F= "/^${PARAM} = /{print \$2}" | sed -e 's|^ ||')
if grep -q "$PARAM" "$FILE"; then
sed -i -e "/^${PARAM}/s|=.*|= $VAL|" "$FILE"
else
echo "${PARAM} = ${VAL}" >>"${FILE}"
fi
done
else
for PARAM in $(echo "$DATA" | awk '{print $1}'); do
if grep -q "$PARAM" "$FILE"; then
sed -i -e "/^${PARAM}/d" "$FILE"
fi
done
_sysctld
fi
elif [ "$OS" == Debian ] || [ "$OS" == Ubuntu ]; then
for PARAM in $(echo "$DATA" | awk '{print $1}'); do
if grep -q "$PARAM" "$FILE"; then
sed -i -e "/^${PARAM}/d" "$FILE"
fi
done
_sysctld
fi
echo "** Applying Kernel parameters."
sysctl -p "$FILE"